Bill Miller is an unsuccessful Broadway performer until his handlers convince him to enhance his act with a stooge—Ted Rogers, a guy positioned in the audience to be the butt of Bill's jokes. After Ted begins to steal the show, Bill's girlfriend and his pals advise him to make Ted an equal partner.

I'll Get By is an updated remake of the 1940 20th Century-Fox musical Tin Pan Alley. William Lundigan and Dennis Day play William Spencer and Freddie Lee respectively, successful song publishers who make hits out of such numbers as "I Got a Gal in Kalamazoo", "Deep in the Heart of Texas", "You Make Me Feel So Young", "There Will Never Be Another You", and other favorites (the rights to all of these songs were conveniently held by 20th Century-Fox). The partnership has some hard times, especially during the feud between ASCAP and the radio networks, when only public-domain songs like "I Dream of Jeannie" were permitted to be broadcast.